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Code Issues Projects Releases Wiki Activity

Use safe ASCII decoding in ModemImpl.

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This commit is contained in:
akwizgran
2018-10-29 16:48:18 +00:00
parent e2ce49c30e
commit eb3983f6b2
1 changed files with 22 additions and 4 deletions
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26
bramble-java/src/main/java/org/briarproject/bramble/plugin/modem/ModemImpl.java
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@@ -10,6 +10,10 @@ import org.briarproject.bramble.api.system.Clock;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.concurrent.Executor;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.Condition;
@@ -22,6 +26,7 @@ import javax.annotation.Nullable;
import jssc.SerialPortEvent;
import jssc.SerialPortEventListener;
import static java.nio.charset.CodingErrorAction.IGNORE;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.logging.Level.INFO;
import static java.util.logging.Level.WARNING;
@@ -35,6 +40,8 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
private static final Logger LOG =
Logger.getLogger(ModemImpl.class.getName());
private static final Charset US_ASCII = Charset.forName("US-ASCII");
private static final int MAX_LINE_LENGTH = 256;
private static final int[] BAUD_RATES = {
256000, 128000, 115200, 57600, 38400, 19200, 14400, 9600, 4800, 1200
@@ -106,7 +113,7 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
throw e;
}
// Wait for the event thread to receive "OK"
boolean success = false;
boolean success;
try {
lock.lock();
try {
@@ -353,8 +360,7 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
for (int i = 0; i < b.length; i++) {
line[lineLen] = b[i];
if (b[i] == '\n') {
// FIXME: Use CharsetDecoder to catch invalid ASCII
String s = new String(line, 0, lineLen, "US-ASCII").trim();
String s = toAscii(line, lineLen).trim();
lineLen = 0;
if (LOG.isLoggable(INFO)) LOG.info("Modem status: " + s);
if (s.startsWith("CONNECT")) {
@@ -436,7 +442,7 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
throw e;
}
// Wait for the event thread to receive "CONNECT"
boolean success = false;
boolean success;
try {
lock.lock();
try {
@@ -461,4 +467,16 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
stateChange.release();
}
}
private String toAscii(byte[] bytes, int len) {
CharsetDecoder decoder = US_ASCII.newDecoder();
decoder.onMalformedInput(IGNORE);
decoder.onUnmappableCharacter(IGNORE);
ByteBuffer buffer = ByteBuffer.wrap(bytes, 0, len);
try {
return decoder.decode(buffer).toString();
} catch (CharacterCodingException e) {
throw new RuntimeException(e);
}
}
}